CN-224233329-U - High-voltage protection circuit and high-voltage protection system

CN224233329UCN 224233329 UCN224233329 UCN 224233329UCN-224233329-U

Abstract

The utility model discloses a high-voltage protection circuit and a high-voltage protection system, which relate to the technical field of high-voltage protection, wherein when the voltage at two ends of a low-voltage source is larger than a preset withstand voltage value, the impedance of a voltage stabilizing module is changed from high impedance to low impedance, the voltage at two ends of the low-voltage source is kept at the preset withstand voltage value, meanwhile, the voltage at two ends of the low-voltage source acquired by a voltage acquisition module is compared with the preset voltage by a comparison module, a prompt signal is generated when the voltage at two ends of the low-voltage source is larger than the preset voltage, and the prompt signal is fed back to prompt equipment. The voltage acquisition module acquires the voltages at the two ends of the low-voltage source, the comparison module is used for comparing the acquired voltages at the two ends of the low-voltage source with preset voltages, a prompt signal is generated when the voltages at the two ends of the low-voltage source are larger than the preset voltages, the prompt signal is fed back to the prompt equipment, a user is informed of high-voltage protection of a device to be tested in time, and the safety of the high-voltage protection circuit is improved.

Inventors

DONG CHENG
XU LI

Assignees

苏州联讯仪器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241225

Claims (9)

1. A high voltage protection circuit, comprising: The voltage stabilizing module is connected with two ends of a low-voltage source, and is used for clamping the voltage at two ends of the low-voltage source at a preset withstand voltage value when the voltage at two ends of the low-voltage source is larger than the preset withstand voltage value; The input end of the voltage acquisition module is connected with two ends of the low-voltage source and is used for acquiring the voltages of the two ends of the low-voltage source; The comparison module is connected with the output end of the voltage acquisition module and is used for generating a prompt signal when the voltage is larger than a preset voltage and feeding the prompt signal back to the prompt equipment; Further comprises: the input end of the voltage follower is connected with the output end of the voltage acquisition module, and the output end of the voltage follower is connected with the comparison module.
2. The high voltage protection circuit of claim 1, wherein the output positive terminal of the low voltage source is connected to the device under test via a triaxial cable.
3. The high voltage protection circuit of claim 2, wherein the voltage regulator module comprises: The first end of the first gas discharge tube is connected with the high end of the triaxial cable, the second end of the first gas discharge tube is respectively connected with the first end of the second gas discharge tube and the protection end of the triaxial cable, and the first gas discharge tube is used for clamping the difference value of the voltages at the two ends of the first gas discharge tube at a first preset differential pressure threshold value when the difference value of the voltages at the two ends of the first gas discharge tube is larger than the first preset differential pressure threshold value; The second end of the second gas discharge tube is connected with the output negative end of the low-voltage source, and is used for clamping the difference value of the voltages at the two ends of the second gas discharge tube at a second preset pressure difference threshold value when the voltage of the protection end is larger than the second preset pressure difference threshold value.
4. The high voltage protection circuit of claim 3, wherein the voltage acquisition module comprises a first voltage dividing resistor and a second voltage dividing resistor, a first end of the first voltage dividing resistor is connected with a first end of the second gas discharge tube, a second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor, a common end of the second voltage dividing resistor is connected with the comparison module, and a second end of the second voltage dividing resistor is connected with a second end of the second gas discharge tube.
5. The high voltage protection circuit of claim 3, further comprising: and the first end of the first switch is connected with the second end of the first gas discharge tube, and the second end of the first switch is respectively connected with the first end of the second gas discharge tube and the protection end of the triaxial cable and is used for being disconnected during parameter test under low-voltage characteristics and being closed during parameter test under high-voltage characteristics.
6. The high voltage protection circuit of claim 1, further comprising: and the input end of the absolute value circuit is connected with the output end of the voltage acquisition module, and the output end of the absolute value circuit is connected with the comparison module and is used for converting the output voltage into positive voltage when the output voltage of the voltage acquisition module is a negative value.
7. The high voltage protection circuit of claim 6, wherein the absolute value circuit comprises: The first end of the first resistor is connected with the output end of the voltage acquisition module, and the second end of the first resistor is connected with the inverting input end of the first amplifier; the non-inverting input end of the first amplifier is grounded, and the output end of the first amplifier is connected with the anode of the diode and is used for converting the output voltage into positive voltage when the output voltage of the voltage acquisition module is negative; the non-inverting input end of the second amplifier is connected with the cathode of the diode, and the output end of the second amplifier is connected with the comparison module and is used for outputting the positive voltage; The first end of the second resistor is connected with the output end of the voltage acquisition module, and the second end of the second resistor is connected with the non-inverting input end of the second amplifier; The first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the non-inverting input end of the second amplifier; the diode is used for being not conducted when the output voltage of the voltage acquisition module is positive, and being conducted when the output voltage of the voltage acquisition module is negative.
8. The high voltage protection circuit according to any one of claims 1 to 7, further comprising: The first end of the second switch is connected with the device to be tested, and the second end of the second switch is connected with the positive output end of the low-voltage source; And the processor is connected with the output end of the comparison module and is used for controlling the second switch to be disconnected when the prompting signal is received.
9. A high voltage protection system comprising a device under test and a high voltage protection circuit according to any one of claims 1 to 8, said high voltage protection circuit being connected to said device under test.

Description

High-voltage protection circuit and high-voltage protection system Technical Field The utility model relates to the technical field of high-voltage protection, in particular to a high-voltage protection circuit and a high-voltage protection system. Background With the rapid development of the semiconductor industry, semiconductor manufacturers have increasingly demanded product testing, and correspondingly, the demands for voltage have also become higher. When testing devices to be tested in some products, a high voltage source for providing high voltage and a voltage source for providing low voltage are connected to the devices to be tested, so as to realize parameter test under high voltage characteristics. When the device to be tested breaks down or is abnormally conducted, transient voltage suppression diodes connected in parallel to two ends of the device to be tested can absorb surge power to isolate the influence of high voltage, and although most of energy can be quickly absorbed by the transient voltage suppression diodes in the mode to protect a low-voltage source from impact, a user cannot know that the device to be tested is subjected to high-voltage protection in time, and the safety of a high-voltage protection circuit is reduced. Disclosure of utility model The utility model aims to provide a high-voltage protection circuit and a high-voltage protection system, which generate a prompt signal when the voltage at two ends of a low-voltage source acquired by a comparison module is larger than a preset voltage, and feed the prompt signal back to prompt equipment so as to inform a user that a device to be tested is subjected to high-voltage protection in time, thereby improving the safety of the high-voltage protection circuit. In order to solve the above technical problems, the present utility model provides a high voltage protection circuit, including: The voltage stabilizing module is connected with two ends of a low-voltage source, and is used for clamping the voltage at two ends of the low-voltage source at a preset withstand voltage value when the voltage at two ends of the low-voltage source is larger than the preset withstand voltage value; The input end of the voltage acquisition module is connected with two ends of the low-voltage source and is used for acquiring the voltages of the two ends of the low-voltage source; The comparison module is connected with the output end of the voltage acquisition module and is used for generating a prompt signal when the voltage is larger than a preset voltage and feeding the prompt signal back to the prompt equipment. Optionally, the output positive end of the low-voltage source is connected with the device to be tested through a triaxial cable. Optionally, the voltage stabilizing module includes: The first end of the first gas discharge tube is connected with the high end of the triaxial cable, the second end of the first gas discharge tube is connected with the first end of the second gas discharge tube and the protection end of the triaxial cable respectively, and the first gas discharge tube is used for clamping the difference value of the voltages at the two ends of the first gas discharge tube at a first preset differential pressure threshold value when the difference value of the voltages at the two ends of the first gas discharge tube is larger than the first preset differential pressure threshold value; and the second end of the second gas discharge tube is connected with the output negative end of the low-voltage source and is used for clamping the difference value of the voltages at two ends of the second gas discharge tube at a second preset pressure difference threshold value when the voltage of the protection end is larger than the second preset pressure difference threshold value. Optionally, the voltage acquisition module includes first bleeder resistor and second bleeder resistor, first bleeder resistor's first end with the first end of second gas discharge tube is connected, the second end with the first end of second bleeder resistor is connected and the public end of connection with the comparison module is connected, the second bleeder resistor's second end with the second end of second gas discharge tube is connected. Optionally, the method further comprises: and the first end of the first switch is connected with the second end of the first gas discharge tube, and the second end of the first switch is respectively connected with the first end of the second gas discharge tube and the protection end of the triaxial cable and is used for being disconnected during parameter test under low-voltage characteristics and being closed during parameter test under high-voltage characteristics. Optionally, the method further comprises: the input end of the voltage follower is connected with the output end of the voltage acquisition module, and the output end of the voltage follower is connected with the comparison module. Optionally, the met